- What are electromagnetic fields?
- Static and low-frequency fields
- What are static and low-frequency electric and magnetic fields?
- Direct and alternating voltage
- Effects of static and low-frequency fields
- Reports & Evaluations
- Radiation protection relating to the expansion of the national grid
- Basics transfer of electrical power
- High-frequency fields
- What are high-frequency fields?
- Applications high-frequency fields
- Radiation protection in mobile communication
- What is mobile communication?
- Reports and evaluations
- What is optical radiation?
- UV radiation
- What is UV radiation?
- Sun but safe!
- Effects of UV radiation
- Protection against UV radiation
- UV index
- Infrared radiation
- What is ionising radiation?
- Radioactivity in the environment
- Where does radioactivity occur in the environment?
- What is the level of natural radiation exposure in Germany?
- Air, soil and water
- Building materials
- Industrial residues (NORM)
- BfS laboratories
- Applications in medicine
- Radiation protection in medicine: international activities
- Applications in daily life and in technology
- Radioactive radiation sources in Germany
- Register high-level radioactive radiation sources
- Type approval procedure pursuant to RöV and StrlSchV
- Cabin luggage security checks
- Radioactive materials in watches
- Ionisation smoke detectors (ISM)
- What are the effects of radiation?
- Acute radiation damage
- Effects of selected radioactive materials
- Consequences of a radiation accident
- Cancer and leukaemia
- Genetic radiation effects
- Individual radiosensitivity
- Epidemiology of radiation-induced diseases
- Ionising radiation: positive effects?
- Risk estimation and assessment
- Radiation protection
- Basic informations
- Occupational radiation protection
- Nuclear accident management
- What happens in an emergency?
- Federal and state tasks
- In the event of an emergency
- Measuring networks
- Exercises for emergency situations
- Nuclear accidents
- Defence against nuclear hazards
- Service offers
- Radon measurements
- Incorporation monitoring
- Biological dosimetry
- Online library
- About us
- Science and research
- Research concept
- Scientific collaborations
- EU research framework programme
- BfS research programme
- Third-party funded research
- Departmental research
- Selected research projects
- Selected research results
- Professional opinions
- Laws and regulations
- BfS Topics in the Bundestag
Radar systems are used in a large variety of places and a wide range of applications, for example
- in civil and military air surveillance,
- on ships,
- in weather observations,
- in road traffic monitoring,
- in vehicle driver assistance systems, such as adaptive cruise control and emergency brake assist,
- in level measurement systems for liquid tanks or bulk storage silos.
The frequencies used range from 1 to 100 gigahertz (see table Sources of high-frequency fields). The transmitter powers depend on the particular application and may vary from a few milliwatts up to the megawatt range (pulse power) for wide-range radar systems.
Exposure from radar systems
Air surveillance and weather observations
Radar systems used for air surveillance and weather observations predominantly radiate their energy upwards into the airspace. The exposure from the fields in the vicinity of radars in areas of public access is low. This has been demonstrated, for instance, by measurements carried out at weather surveillance radar sites in Great Britain. Adverse effects to the public are not expected.
Radar systems on ships
Radar systems on ships do not present a hazard to the general public - for example in the vicinity of a waterway bank.
Speed control radars
The exposure from radar devices for traffic speed control amounts to only a fraction of the limits recommended for the protection of human health. At working distance, they are harmless to the health of the operating personnel as well as to public health.
Driver assistance systems in motor vehicles
Compared to other applications, relatively little information on radar devices for driver assistance systems in motor vehicles is available at the moment. The focusing of the radiated power and the shielding effect of the metal vehicle body ensure that the individuals in the vehicle are practically not exposed. As radiated powers are low and the devices are usually inactive when the vehicle is stationary, a health risk to other road users or pedestrians is not expected.
Stationary radar installations are considered stationary radio installations as defined by the Ordinance concerning the Controls for the Limitation of Electromagnetic Fields (BEMFV). A valid site certificate issued by the Federal Network Agency is required for operating installations at locations with an installed radiated power of 10 watts (assuming omnidirectional homogeneous emission) or more. This especially affects radar systems for air surveillance and weather observations. The site certification procedure is laid down in the "BEMFV" of 20 August 2002. The ordinance was last modified on 14 August 2013.
In the site certificate, the Federal Network Agency indicates an individual safety distance for the relevant location. Outside the safety distance, the limit values set in the 26th Ordinance implementing the Federal Immission Control Act (26. BlmSchV) are complied with. When determining the safety distance, the Federal Network Agency takes stationary radio installations in the frequency range from 9 kilohertz to 300 gigahertz that are already installed at the location and in its vicinity into account. Newly planned installations are considered, provided they are known.
Stray X-rays may emanate from high-power radar transmitters
Stray X-rays may also be produced within high-power radar transmitters - depending on their design - as an unwanted side effect (see Final report of the Radar Commission). However, a health-relevant exposure from X-radiation cannot occur when safety regulations are complied with.
State of 2017.11.09